{"id":17410,"date":"2022-06-27T14:30:20","date_gmt":"2022-06-27T14:30:20","guid":{"rendered":"https:\/\/zecovalve.com\/?p=17410"},"modified":"2022-10-17T06:11:15","modified_gmt":"2022-10-17T06:11:15","slug":"the-reasons-for-the-damage-of-the-butterfly-valve-seat","status":"publish","type":"post","link":"https:\/\/zecovalve.com\/de\/the-reasons-for-the-damage-of-the-butterfly-valve-seat.html","title":{"rendered":"Die Gr\u00fcnde f\u00fcr die Besch\u00e4digung des Absperrklappensitzes"},"content":{"rendered":"<p>Der Sitz der Absperrklappe, auch Dichtring genannt, ist ein Bauteil, das mit der Dichtleistung der Absperrklappe zusammenh\u00e4ngt. Er ist auch die Stelle, die durch das Medium in der Rohrleitung am st\u00e4rksten korrodiert und erodiert wird. Eine Besch\u00e4digung des Sitzes der Absperrklappe f\u00fchrt zu Undichtigkeiten an der Absperrklappe. Bei schwerwiegenden Undichtigkeiten kann dies sogar ein erhebliches Sicherheitsrisiko darstellen und unsere Arbeit beeintr\u00e4chtigen. Was sind die Gr\u00fcnde f\u00fcr die Besch\u00e4digung des Absperrklappensitzes?<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-reasons-for-the-damage-of-the-butterfly-valve-seat-are-as-follows\"><strong>Die Gr\u00fcnde f\u00fcr die Besch\u00e4digung des Klappensitzes sind folgende:<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>1) Es besteht ein Problem mit der Verarbeitungsqualit\u00e4t des Absperrklappensitzes. Der Verarbeitungsprozess ist nicht gr\u00fcndlich genug, was zu Rissen, Poren und ungleichm\u00e4\u00dfiger H\u00e4rte am Dichtring f\u00fchrt.<\/li><li>2) Die Ursache liegt in einer falschen Auswahl oder Bedienung der Absperrklappe. Wenn das Absperrklappenmodell nicht richtig entsprechend der tats\u00e4chlichen Arbeitsumgebung ausgew\u00e4hlt wird, entspricht die Absperrklappe nicht den Arbeitsbedingungen und der Dichtring des Ventilsitzes wird besch\u00e4digt.<\/li><li>3) Die Installation der Absperrklappe erfolgt willk\u00fcrlich oder die Wartung ist nicht gut, was zu einer Besch\u00e4digung des Ventilsitzes f\u00fchrt. Vor der Installation der Absperrklappe werden das Innere des Ventilk\u00f6rpers und die Rohrleitung nicht gereinigt, was zu Verunreinigungen in der Rohrleitung f\u00fchrt, die den Sitz der Absperrklappe besch\u00e4digen. Dann kommt es noch dazu, dass die Absperrklappe nicht rechtzeitig gewartet wird, was die Absperrklappe in einem ungesunden Zustand h\u00e4lt und den Sitzdichtring der Absperrklappe vorzeitig besch\u00e4digt.<\/li><li>4) Die chemische Korrosion des Mediums am Drosselklappensitz. Das Medium um den Dichtungsring des Drosselklappensitzes spielt eine direkte chemische Rolle mit dem Drosselklappensitz und korrodiert den Ventilsitz unter der Bedingung, dass kein Strom erzeugt wird.<\/li><li>5) Die Erosion des Mediums in der Rohrleitung des Absperrklappensitzes, der Sitzdichtring der Absperrklappe befindet sich innerhalb der Rohrleitung, die Erosion des Ventilsitzes ist kontinuierlich, diese Medien enthalten Schwebeteilchen und einige sind korrosiv. Wenn der Ventilsitz durch ein solches Medium erodiert wird, wird die Dichtfl\u00e4che besch\u00e4digt.<\/li><li>6) Mechanische Besch\u00e4digung des Sitzes der Absperrklappe. Bei jedem \u00d6ffnen und Schlie\u00dfen der Absperrklappe reibt sie am Sitz der Absperrklappe und die Besch\u00e4digung der Dichtfl\u00e4che nimmt mit der Zeit zu.<\/li><li>7) Die elektrochemische Korrosion des Absperrklappensitzes, der Kontakt der Dichtfl\u00e4chen untereinander, der Kontakt zwischen Dichtring und Schlie\u00dfk\u00f6rper und Ventilk\u00f6rper sowie der Konzentrationsunterschied des Mediums, der Sauerstoffkonzentrationsunterschied usw. f\u00fchren zu einem Potentialunterschied und es kommt zu elektrochemischer Korrosion, was zur Korrosion des Ventilsitzdichtrings auf der Anodenseite f\u00fchrt.<\/li><li>8) Erm\u00fcdungssch\u00e4den am Drosselklappensitz. Der Drosselklappensitz hat seine eigene Lebensdauer. Insbesondere der Ventilsitz einer weichdichtenden Drosselklappe hat eine begrenzte Lebensdauer. Bei l\u00e4ngerem Gebrauch altert er leicht und die Dichtfl\u00e4che weist Risse und Delaminationen auf, was zu einer mangelhaften Dichtleistung f\u00fchrt.<\/li><\/ul>\n\n\n\n<p>Die Zeco Valve Group h\u00e4lt stets an dem Gesch\u00e4ftsgrundsatz fest, \u201emit Technologie eine Marke zu schaffen und mit Qualit\u00e4t Kundenzufriedenheit zu gewinnen\u201c, und hat sich einen guten Ruf auf dem Markt und ein stabiles Kundennetzwerk erarbeitet. Die Kreditw\u00fcrdigkeit des Unternehmens ist immer \u201eAAA\u201c. Wir hoffen aufrichtig, mit Ihnen zusammenarbeiten zu k\u00f6nnen, um die Herstellung und Anwendung chinesischer Ventilprodukte auf ein neues Niveau zu bringen. Wenn Sie irgendwelche Bed\u00fcrfnisse haben, k\u00f6nnen Sie uns gerne konsultieren.<\/p>","protected":false},"excerpt":{"rendered":"<p>Der Sitz der Absperrklappe, auch Dichtring genannt, ist ein Bauteil, das f\u00fcr die Dichtleistung der Absperrklappe zust\u00e4ndig ist \u2026 <a title=\"Die Gr\u00fcnde f\u00fcr die Besch\u00e4digung des Absperrklappensitzes\" class=\"read-more\" href=\"https:\/\/zecovalve.com\/de\/the-reasons-for-the-damage-of-the-butterfly-valve-seat.html\" aria-label=\"Mehr zu Die Gr\u00fcnde f\u00fcr die Besch\u00e4digung des Klappensitzes\">Weiterlesen ...<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[2210],"tags":[1997,1998,3235],"class_list":["post-17410","post","type-post","status-publish","format-standard","hentry","category-butterfly-valve","tag-pctfe-valve-seat","tag-pctfe-valve-seat-manufacturer","tag-valve-seat-rings","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":false,"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/de\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":2210,"name":"Butterfly Valve","slug":"butterfly-valve","term_group":0,"term_taxonomy_id":2210,"taxonomy":"category","description":"","parent":0,"count":49,"filter":"raw","cat_ID":2210,"category_count":49,"category_description":"","cat_name":"Butterfly Valve","category_nicename":"butterfly-valve","category_parent":0}],"tag_info":[{"term_id":1997,"name":"PCTFE Valve Seat","slug":"pctfe-valve-seat","term_group":0,"term_taxonomy_id":1997,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_9e7b7b-8a\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET PCTFE VALVE SEAT PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-pctfe-material\">What is PCTFE Material?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE (Polychlorotrifluoroethylene) PCTFE (Polychlorotrifluoroethylene) is a homopolymer of Chlorotrifluoroethylene. PCTFE is a unique fluoropolymer that is capable of maintaining its physical properties at exceptionally low operating temperatures.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE has excellent chemical resistance, radiation resistance, and flammability characteristics. The material has a useful temperature range of -400\u00b0F to 380\u00b0F. PCTFE is resistant to cold flow and it has the lowest coefficient of thermal expansion of any unfilled fluoropolymer. These characteristics make it an excellent choice when dimensional stability is critical.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE is often used for aerospace applications when chemical resistance, a broad operating temperature range, and low flammability are required. It is also extensively used for cryogenic valve applications.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Key Properties of PCTFE Material<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:list -->\r\n<ul>\r\n \t<li>Dimensionally stable, rigid, and resistant to cold flow<\/li>\r\n \t<li>Very low gas permeation and outgassing<\/li>\r\n \t<li>Near zero moisture absorption<\/li>\r\n \t<li>Excellent chemical resistance<\/li>\r\n \t<li>High compression strength<\/li>\r\n \t<li>Low deformation under load<\/li>\r\n \t<li>Non-flammable<\/li>\r\n \t<li>Temperature range: -400\u00b0 to 380\u00b0F<\/li>\r\n \t<li>Radiation Resistance<\/li>\r\n<\/ul>\r\n<!-- \/wp:list -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>Property<\/td>\r\n<td>Value<\/td>\r\n<td>Units<\/td>\r\n<td>Method<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Tensile Strength<\/td>\r\n<td>4860 - 5710\r\n34 - 39<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td>D 638<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Elongation<\/td>\r\n<td>100 - 250<\/td>\r\n<td>%<\/td>\r\n<td>D 638<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flexural Strength, 73\u00b0F<\/td>\r\n<td>9570 - 10300\r\n66 - 71<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flex Modulus<\/td>\r\n<td>200 \u2013 243 x 103\r\n1.4 \u2013 1.7<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Impact Strength, Izod, 23 deg C<\/td>\r\n<td>2.5 \u2013 3.5<\/td>\r\n<td>ft-lb\/in<\/td>\r\n<td>D 256<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Compressive Stress at 1% deformation,<\/td>\r\n<td>1570 \u2013 1860\r\n11 - 13<\/td>\r\n<td>psi\r\nMPa<\/td>\r\n<td>D 695<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Density<\/td>\r\n<td>2.10 to 2.17<\/td>\r\n<td>gm\/cu.cm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Coefficient of Linear Expansion<\/td>\r\n<td>7 x 10-5<\/td>\r\n<td>K-1<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Melting Point<\/td>\r\n<td>410 -414\r\n210 - 212<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Thermal Conductivity<\/td>\r\n<td>1.45\r\n0.84<\/td>\r\n<td>Btu\u00b7in\/h\u00b7ft2\u00b7\u00b0F\r\nW\/m\u00b7K<\/td>\r\n<td>ASTM C 177<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Specific Heat<\/td>\r\n<td>0.22\r\n0.92<\/td>\r\n<td>Btu\/lb\/deg F\r\nkJ\/Kg\/deg K<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Heat Distortion Temperature, 66 lb\/sq.in (0.455 MPa)<\/td>\r\n<td>259\r\n126<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td>D 648<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Processing Temperature<\/td>\r\n<td>620\r\n327<\/td>\r\n<td>deg F\r\ndeg C<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dielectric Strength, short time, 0.004\u201d<\/td>\r\n<td>3000<\/td>\r\n<td>Volt\/mil<\/td>\r\n<td>D 149<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Arc-Resistance<\/td>\r\n<td>360<\/td>\r\n<td>sec<\/td>\r\n<td>D 495<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Volume Resistivity, @ 50% RH<\/td>\r\n<td>2 x 1017<\/td>\r\n<td>ohm-cm<\/td>\r\n<td>D 257<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Surface Resistivity, @ 100% RH<\/td>\r\n<td>1 x 1015<\/td>\r\n<td>Ohm sq-1<\/td>\r\n<td>D 257<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dielectric Constant, 1 kHz<\/td>\r\n<td>2.6<\/td>\r\n<td>\u03b5<\/td>\r\n<td>D150-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Dissipation Factor, @ 1 kHz<\/td>\r\n<td>0.02<\/td>\r\n<td><\/td>\r\n<td>D150-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Water Absorption<\/td>\r\n<td>0.00<\/td>\r\n<td>% increase in weight<\/td>\r\n<td>D570-81<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Flame Rating+<\/td>\r\n<td>Non-flammable<\/td>\r\n<td><\/td>\r\n<td>D 635<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Coefficient of friction<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>D 1894<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Specific Gravity<\/td>\r\n<td>2.10 to 2.17<\/td>\r\n<td><\/td>\r\n<td>D792<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Moisture Permeability Constant<\/td>\r\n<td>0.2<\/td>\r\n<td>g\/m, 24 hours<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>O2\u00a0Permeability<\/td>\r\n<td>1.5 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>N2\u00a0Permeability<\/td>\r\n<td>0.18 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>CO2\u00a0Permeability<\/td>\r\n<td>2.9 x 10-10<\/td>\r\n<td>Cc, cm\/sq.cm, sec, atm<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->\r\n\r\n<!-- wp:heading -->\r\n<h2>PCTFE Valve Seat<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nBall valve seats that show signs of swelling, blistering, or \u201cpopcorning\u201d have been permeated at a molecular level. Needless to say, this can cause some serious issues such as leaks and catastrophic failure. The solution is to find a ball valve seat material that is highly resistant to permeation and an excellent choice would be PCTFE. In this week\u2019s blog post, we will talk about PCTFE Ball Valve Seats and how they are used in Low Permeation Applications.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOne of the best materials for a ball valve seat application where permeability is a problem would be PCTFE (Polychlorotrifluoroethylene), a thermoplastic chlorofluoropolymer. PCTFE is sometimes referred to as Modified PTFE or PCTFE, as well as by trade names Kel-F, Voltalef, and Neoflon. PCTFE is often thought of as a second-generation PTFE material that maintains the chemical and thermal resistance of PTFE along with its low friction. It is also similar to other fluoropolymers such as PFA or FEP.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOne of the defining characteristics of PCTFE is that it has a much more dense molecular structure and a low void and micro-porosity content when compared to similar ball valve seat materials. This gives it a very low permeability coefficient, which means that the likelihood of it swelling or popcorning is far lower than other materials. For example, its permeability for O2, N2, CO2, and H2 are 1.5 x 10-10, 0.18 x 10-10, 2.9 x 10-10, and 56.4 x 10-10 darcy, respectively.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE also provides improved toughness and strength along with good deformation recovery and excellent creep and cold-flow resistance. In addition, it has a wide operating temperature range of -100\u00b0F to 500\u00b0F. In fact, it performs extremely well at cryogenic temperatures. Because of its low friction, it also results in a very low ball valve operating torque. PCTFE also exhibits zero moisture absorption and is non-wetting.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE works well in operating environments where other polymers may fail. For example, it is well adapted to nuclear service that may involve high radiation exposure, is non-flammable (D 635), and is resistant to attack by the vast majority of chemicals and oxidizing agents. The only chemicals that might lead to slight swelling are ethers, esters, aromatic solvents, and halocarbon compounds.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":4,"filter":"raw"},{"term_id":1998,"name":"PCTFE Valve Seat Manufacturer","slug":"pctfe-valve-seat-manufacturer","term_group":0,"term_taxonomy_id":1998,"taxonomy":"post_tag","description":"<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_7bd7e9-a7\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET PCTFE VALVE SEAT PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-what-is-pctfe\">What is PCTFE?<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPCTFE(Polychlorotrifluoroethylene) is a fluorocarbon-based polymer. It offers a unique combination of physical and mechanical properties, nonflammability, and low permeation capability to moisture and steam atmosphere compared to other plastics. The heat resistance and chemical resistance capability are less than PFA and FEP, however, mechanical characteristics(especially hardness) are superior. It is suitable for utilizing in the temperature range of -200\u2103\uff5e150\u2103, especially for cryogenic applications such as oxygen, hydrogen, nitrogen, and more. PCTFE has a very strong resistance performance to low temperatures.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>Property List of PCTFE<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Item<\/strong><\/td>\r\n<td><strong>Color<\/strong><\/td>\r\n<td><strong>Density<\/strong><\/td>\r\n<td><strong>Hardness<\/strong><\/td>\r\n<td><strong>Compressive strength<\/strong><\/td>\r\n<td><strong>Long-term Temp.<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Units<\/td>\r\n<td><\/td>\r\n<td>g\/cm3<\/td>\r\n<td>Shore D<\/td>\r\n<td>Mpa<\/td>\r\n<td>\u2103<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Value<\/td>\r\n<td>Translucent<\/td>\r\n<td>2.13<\/td>\r\n<td>75-85<\/td>\r\n<td>80<\/td>\r\n<td>-80~115<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->\r\n\r\n<!-- wp:heading -->\r\n<h2><strong><a href=\"https:\/\/zecovalve.com\/product-category\/ball-valve\"><mark class=\"has-inline-color has-contrast-2-color\" style=\"background-color: var(--base)\">Ball Valve<\/mark><\/a><\/strong> Seats<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSeats and inserts, which are important components in the valve industry, are critical components, PTFE is very often chosen as the raw material. PTFE provides a low-friction seat, with excellent media compatibility. Filled grades provide wear resistance and can support seating loads of the higher class of valves.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2><strong><mark class=\"has-inline-color has-contrast-2-color\" style=\"background-color: var(--base)\"><a href=\"https:\/\/zecovalve.com\/product-category\/butterfly-valve\">Butterfly Valve<\/a><\/mark><\/strong> Seats<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPTFE is one of the Butterfly Valve Seat Materials. PTFE Butterfly Valve Seats Are Available in Pure or Reinforced PTFE to Meet Specific Requirements for Different Working Environments.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nPTFE Seats' Excellent Chemical Resistance, High-Temperature Resistance, Self-lubrication, and Low Friction Properties of PTFE Make It a General Material for Valve Seats.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2>VALVE SEAT MATERIAL SELECTION<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:table {\"className\":\"is-style-stripes\"} -->\r\n<figure class=\"wp-block-table is-style-stripes\">\r\n<table>\r\n<thead>\r\n<tr>\r\n<th class=\"has-text-align-center\" data-align=\"center\">Material Name<\/th>\r\n<th>Main Properties<\/th>\r\n<th>Notes<\/th>\r\n<th>Temperature Range<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">VIRGIN PTFE<\/td>\r\n<td>Very low coefficient of friction and excellent chemical resistance.<\/td>\r\n<td>FDA approved<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">15% Glass Filled PTFE<\/td>\r\n<td>Decreased compressive strength and lower deformation under load than virgin PTFE.<\/td>\r\n<td>Abrasive material<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">25% Glass Filled PTFE<\/td>\r\n<td>Similar to 15% Glass better wear resistance, higher compressive strength, and lower deformation under load.<\/td>\r\n<td>Abrasive material<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Stainless Steel Filled PTFE<\/td>\r\n<td>Extremely hard-wearing. Excellent strength and stability under extreme loads and elevated temperatures.<\/td>\r\n<td>Can be used in steam and thermal fluid applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">TFM<\/td>\r\n<td>Much denser polymer structure than Virgin PTFE. Displays better stress recovery.<\/td>\r\n<td>Modified TFE Polymer<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Carbon Graphite filled TFM<\/td>\r\n<td>Lower thermal expansion-contraction rate than conventional TFM.<\/td>\r\n<td>Ideal for use in steam and thermal fluid applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C and even 320\u00b0C on Thermal Fluid applications<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">UHMWPE<\/td>\r\n<td>Highly resistant to corrosive chemicals, with the exception of oxidizing acids and organic solvents.<\/td>\r\n<td>Also known as High Modulus Polyethylene (HMPE) or High-Performance Polyethylene (HPPE)<\/td>\r\n<td>-40\u00b0C to +80\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">PCTFE<\/td>\r\n<td>Excellent for cryogenic and Oxygen use.<\/td>\r\n<td>A homo-polymer of Chlorotrifluoroethylene<\/td>\r\n<td>-270\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Virgin PEEK 450G<\/td>\r\n<td>Excellent chemical resistance and mechanical properties at elevated temperatures.<\/td>\r\n<td>An organic polymer thermoplastic<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Carbon Filled PEEK<\/td>\r\n<td>Many similar properties to Virgin PEEK. Particularly suitable for elevated temperatures and high-load situations.<\/td>\r\n<td>Low coefficient of friction and suitable for many extremely corrosive applications<\/td>\r\n<td>-40\u00b0C to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">PEEK HT<\/td>\r\n<td>Retains all key features and benefits of PEEK 450G but retains physical properties to a higher temperature.<\/td>\r\n<td>Can be supplied in both virgins unfilled or as-filled compounded material<\/td>\r\n<td>up to 260\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"has-text-align-center\" data-align=\"center\">Acetal and Delrin<\/td>\r\n<td>Displays good resistance to wear and deformation under load.<\/td>\r\n<td>Excellent for valve seat applications<\/td>\r\n<td>up to 80\u00b0C<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<!-- \/wp:table -->","parent":0,"count":5,"filter":"raw"},{"term_id":3235,"name":"Valve Seat Rings","slug":"valve-seat-rings","term_group":0,"term_taxonomy_id":3235,"taxonomy":"post_tag","description":"<!-- wp:paragraph -->\r\n\r\nThe Valve seat or seat ring is used to support the valve plug or disc in a fully closed position and to form a sealing part. Usually, the valve seat diameter is the maximum flow diameter of the valve. The seat material is very wide, all kinds of rubber, plastic, and metal materials can be used as seat material, such as EPDM, NBR, NR, PTF.E, PEEK, PFA, SS315, STELLITE, and so on\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:kadence\/tableofcontents {\"uniqueID\":\"_6f889b-ad\"} \/-->\r\n\r\n<!-- wp:generateblocks\/button-container {\"uniqueId\":\"6d8495a3\",\"isDynamic\":true,\"blockVersion\":2} -->\r\n<!-- wp:generateblocks\/button {\"uniqueId\":\"3d442e11\",\"hasUrl\":true,\"target\":true,\"backgroundColor\":\"#0366d6\",\"textColor\":\"#ffffff\",\"backgroundColorHover\":\"#222222\",\"textColorHover\":\"#ffffff\",\"paddingTop\":\"15\",\"paddingRight\":\"20\",\"paddingBottom\":\"15\",\"paddingLeft\":\"20\"} -->\r\n<a class=\"gb-button gb-button-3d442e11 gb-button-text\" href=\"mailto:commercial@zecovalve.com\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>GET VALVE SEAT RINGS PRICE<\/strong><\/a>\r\n<!-- \/wp:generateblocks\/button -->\r\n<!-- \/wp:generateblocks\/button-container -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the butterfly valve, the seat material usually are rubbers, such as EPDM, NBR, NR (Natural hard rubber)\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the ball valve and plug valve the seat material usually is plastics, such as PTFE, PEEK, and so on.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor the globe valve and gate valve the seat material usually is metal to metal.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor valves using soft seat material, their shut-off performance is great and even can reach zero bubble seat tightness. while the disadvantaged part is they can not resist high temperature and high-pressure applications.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nOn the other hand, those valve's seat material is metal to metal therefore they can stand with high-pressure ratings up to 2500LB.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading -->\r\n<h2 id=\"h-types-of-seat-rings\">Types of Seat Rings<\/h2>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Soft Seat (Nonmetallic Seat Ring)<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe majority of valves have soft seat inserts and elastomer or polymer seals. The nonmetallic seat ring is made from e.g. Teflon. The ring is held against the ball by an insert. For fire-safe service, a secondary metal-to-metal seating arrangement is required to omit leakage in the event that the soft seat material is lost during a fire. Soft seated valves are recommended for clean service only and are unsuitable for dirty\/abrasive service or high temperatures.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Double Beveled Sealing Ring<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe structure design of a double-beveled sealing ring has been adopted to reduce the friction between the ball and the sealing ring to achieve lower operating torque. When the medium pressure is low, the ball has a smaller contacting surface with a sealing ring, which introduces higher sealing pressure to ensure the sealing reliability. When the medium pressure gets higher, the contacting area between the ball and the sealing ring increases accordingly. A larger contact area reduces the sealing pressure to avoid the deformation of the sealing ring.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Cantilevered lips seat rings<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nSeat rings with cantilevered lips are designed so that the ball contacts initially only the tip of the lip. As the upstream and downstream seats are pre-stressed on an assembly against the ball, the lips de\ufb02ect and put the seat rings into a torsion. When the valve is being closed against the line pressure, the lip of the downstream seat de\ufb02ects still further until \ufb01nally the entire seat surface matches the ball. By this design, the seats have some spring action that promotes good sealing action also at low \ufb02uid pressures. Furthermore, the resilient construction keeps the seats from being crushed at high \ufb02uid loads\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Pressure equalizing slots<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe seat ring shown is provided with peripheral slots, which are known as pressure-equalizing slots. During the closing of the valve, the maximum surge pressure occurs, during which the downstream seat can be forced to intrude into the ball port and the valve can become inoperative. The pressure equalizing slots prevents this potential failure. When pressure causes the upstream seat to move against the ball and the ball moves downstream, the pressure simply leaks into the valve body cavity through the relief slots. The upstream seat ring becomes pressure balanced. Downstream sealing prevents seat damage and lowers operating torque while providing full bidirectional capability. The seats with pressure equalizing slots also permit the valve to operate at a higher pressure differential with lower torques than double sealing valves in which there is sealing between both seats and the ball.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Soft Seat (Metallic Seat Ring)<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nThe metallic seat ring, containing a nonmetallic insert, usually requires spring force to achieve a tight seal. Due to springs, this design is not used in corrosive service. Even though this seat has a metal seat ring, it is categorized as a soft seated ball valve due to its use of soft material insert, which is in contact with the ball.\r\n\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3>Metal to Metal Seats<\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n\r\nFor services unsuitable for soft seating, metal and ceramic seating are being used. In general practice, hard metal seated ball valves (typically stellite) are only used in severe service conditions such as high temperature, high erosion, corrosion or abrasion, slurry, etc. Metal seats are generally not bubble tight. Metal seats and balls are typically lapped in matching sets resulting in perfect roundness and fitness to ensure smooth operation and tight shut-off and achieving \u2018Zero Leakage\u2019. Metal seats come in different classes of Shut Off including Class IV, V, and VI. Metal Seat and Ball are fabricated from base metals coated with hard chrome, tungsten carbide, and Stellite.\r\n\r\n<!-- \/wp:paragraph -->","parent":0,"count":5,"filter":"raw"}],"taxonomy_info":{"category":[{"value":2210,"label":"Butterfly Valve"}],"post_tag":[{"value":1997,"label":"PCTFE Valve Seat"},{"value":1998,"label":"PCTFE Valve Seat Manufacturer"},{"value":3235,"label":"Valve Seat Rings"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Reasons for the Damage of the Butterfly Valve Seat - ZECO Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/de\/the-reasons-for-the-damage-of-the-butterfly-valve-seat.html\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Reasons for the Damage of the Butterfly Valve Seat - ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"The seat of the butterfly valve, also called the sealing ring, is a component related to the sealing performance of the butterfly ... 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